Injection-Molding Machine With Embedded Barrier Preform
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Solution Overview
Problem
Existing injection-molding processes face challenges in reliably producing plastic molded parts with embedded barrier layers of minimal thickness, particularly in food packaging and containers, where preventing oxygen diffusion is crucial, while maintaining process security and cost-effectiveness.
Innovation Solution
A multi-stage injection-molding process using a three-dimensional preform created from a multi-layer barrier film, where the barrier layer is coated on both sides with plastic material, ensuring strong anchoring and protection within the molded part, allowing for the use of extremely thin barrier layers and reducing material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-stage injection-molding process with a three-dimensional preform is used, then the barrier layer can be made extremely thin while maintaining reliability, but the device complexity and process steps increase
Solution Approach 1:
The barrier layer is pre-formed into a three-dimensional preform before injection molding. This preliminary shaping allows the thin barrier layer to be properly positioned and supported during the subsequent injection process, enabling extreme thinness without compromising reliability. The preform serves as a prepared substrate that guides the injection-molded plastic material.
Solution Approach 2:
The production process is divided into multiple stages: first forming the three-dimensional preform from the barrier layer, then performing injection molding in subsequent stages. This segmentation allows each stage to be optimized independently, enabling the use of extremely thin barrier layers while maintaining overall process reliability through controlled multi-stage manufacturing.
2Strength
If the barrier layer is coated on both sides with plastic material, then the anchoring strength is improved, but the quantity of material and processing steps increase
Solution Approach 1:
The barrier layer is nested within the injection-molded plastic molded part, with plastic material coating both sides of the barrier layer. This nesting structure provides strong anchoring of the thin barrier layer within the bulk plastic material, distributing stresses and preventing delamination while using minimal barrier layer material.
Solution Approach 2:
The final product is a composite structure combining the barrier layer with injection-molded plastic material. This composite construction leverages the complementary properties of each material: the barrier layer provides oxygen diffusion prevention, while the plastic material provides structural strength and anchoring, achieving strong bonding with minimal barrier layer thickness.
3Productivity
If a turning unit with a third sub-tool is used to convey the intermediate product, then the productivity is improved, but the device complexity increases
Solution Approach 1:
The third sub-tool is designed as a rotating component that can dynamically change its position and orientation. This dynamic capability allows the intermediate product to be conveyed between different mold mounting plates during the multi-stage injection process, enabling continuous production and higher productivity through automated repositioning rather than manual intervention.
4Quantity of substance
If the barrier layer is made extremely thin to reduce costs, then the material cost is reduced, but the handling difficulty and process complexity increase
Solution Approach 1:
The barrier layer is pre-formed into a three-dimensional preform before the injection molding process. This preliminary shaping provides structural support to the extremely thin barrier layer, making it easier to handle and position during subsequent processing steps while maintaining its minimal thickness for cost reduction.
Solution Approach 2:
The thin barrier layer is nested within the injection-molded plastic molded part, where the surrounding plastic material provides mechanical support and protection. This nesting structure allows the barrier layer to be extremely thin without compromising handling ease, as the bulk plastic material shields and supports the fragile thin barrier layer during processing and operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enables the production of reliable plastic molded parts with embedded barrier layers that are thin, durable, and cost-effective, effectively preventing oxygen diffusion, while simplifying handling and enhancing the properties of the end product.
Implementation Method 1
the plastic melt injected into the tool connects with the coating material of the barrier film cutout, which has been melted or superficially melted
Implementation Method 2
this leads to particularly strong and permanently reliable anchoring of the barrier layer in the injection-molded plastic molded part
Data Source
AI summary
The production of a plastic molded part utilizes a barrier layer embedded in plastic. Plastic is injection-molded successively in different cavities of the injection mold onto a three-dimensional preform made from a cut of a multi-layer barrier film, which multi-layer barrier film comprises a barrier layer coated with plastic on both sides. The plastic coating of the barrier film cut is at least superficially melted by the injected plastic melt. And the preform is supported by a support formed on the corresponding partial mold on the respective opposite side.